Hyperbranched Polybenzobisthiazole with High Thermal Stability, Good Organosolubility, and Interesting Optical Performance

Abstract

A series of hyperbranched poly(p‐phenylene benzobisthiazole)s (HBPBZTs) are synthesized by solution polycondensation of 2,5‐diamino‐1,4‐benzenedithiol dihydrochloride (DABDT, A2 monomer) and 1,3,5‐benzene‐tricarboxylic acid (BTA, B3 monomer). Their structure changes depending on the feed molar ratios (A2:B3). The addition of DABDT and BTA (3:2) yielded HBPBZT with stoichiometry equivalent carboxyl and o‐aminothiophenol end groups. By adding DABDT and BTA (1:1), carboxyl‐terminated HBPBZT is prepared. When the ratio of DABDT and BTA is 9:4, amino and sulfydryl‐terminated HBPBZT is obtained. These polymers are amorphous and exhibit good thermal stability. They are soluble in some common polar aprotic solvents. The HBPBZTs exhibit strong blue light in methansulfonic acid and in DMF solution. The type of solvent has a strong influence on optical properties of the HBPBZTs solution.

Novel fluorescent porous hyperbranched aromatic polyamide containing 1,3,5‐triphenylbenzene moieties: Synthesis and characterization

“…Therefore, the fluorescence intensity of HP‐COOH is lower than that of HP‐NH 2 , and the maximum emission wavelength of HP‐NH 2 is 2 nm red‐shift than that of HP‐COOH. This is in accordance with our previous study …”

Synthesis and properties of novel benzobisthiazole‐containing hyperbranched polyamides derived from 2,6‐diaminobenzo[1,2‐d:4,5‐d']bisthiazole

“…Therefore, the fluorescence intensity of HB‐COOH is lower than that of HB‐NH 2 , and the maximum emission wavelength of HB‐NH 2 is 9 nm red‐shift than that of HB‐COOH. This is in accordance with our previous study . These two hyperbranched polymers are potential useful in the area of blue light emitting and display.…”

“…Poly(p‐phenylene benzobisthiazole) (PBZT) is a kind of aromatic heterocycte conjugated polymer, which is well known for its excellent mechanical properties (high tensile strength and modulus), high chemical and thermo‐oxidative resistance, and large and ultrafast third‐order nonlinear optics (NLO) response . While the insolubility of PBZT in common organic solvents which deriving from its high degree of molecular rigidity and strong intermolecular interactions makes PBZT difficult to process and impedes more detailed and accurate studies on this type of conjugated polymer.…”

“…While the insolubility of PBZT in common organic solvents which deriving from its high degree of molecular rigidity and strong intermolecular interactions makes PBZT difficult to process and impedes more detailed and accurate studies on this type of conjugated polymer. To solve this problem, introducing hyperbranched structure into rigid PBZT backbone by an A 2 + B 3 method was found be effective in our previous work . The prepared hyperbranched poly(p‐phenylene benzobisthiazole)s was soluble in organic solvents and their DMF solutions emit strong blue light under the excitation of ultraviolet (UV) light …”

“…To solve this problem, introducing hyperbranched structure into rigid PBZT backbone by an A 2 + B 3 method was found be effective in our previous work . The prepared hyperbranched poly(p‐phenylene benzobisthiazole)s was soluble in organic solvents and their DMF solutions emit strong blue light under the excitation of ultraviolet (UV) light …”